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#define _GNU_SOURCE
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <inttypes.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include "lookup.h"
#define ALIGN (sizeof(struct { char a; char *b; }) - sizeof(char *))
int getservbyname_r(const char *name, const char *prots,
struct servent *se, char *buf, size_t buflen, struct servent **res)
{
struct service servs[MAXSERVS];
int cnt, proto, align;
*res = 0;
/* Don't treat numeric port number strings as service records. */
char *end = "";
strtoul(name, &end, 10);
if (!*end) return ENOENT;
/* Align buffer */
align = -(uintptr_t)buf & ALIGN-1;
if (buflen < 2*sizeof(char *)+align)
return ERANGE;
buf += align;
if (!prots) proto = 0;
else if (!strcmp(prots, "tcp")) proto = IPPROTO_TCP;
else if (!strcmp(prots, "udp")) proto = IPPROTO_UDP;
else return EINVAL;
cnt = __lookup_serv(servs, name, proto, 0, 0);
if (cnt<0) switch (cnt) {
case EAI_MEMORY:
case EAI_SYSTEM:
return ENOMEM;
default:
return ENOENT;
}
se->s_name = (char *)name;
se->s_aliases = (void *)buf;
se->s_aliases[0] = se->s_name;
se->s_aliases[1] = 0;
se->s_port = htons(servs[0].port);
se->s_proto = servs[0].proto == IPPROTO_TCP ? "tcp" : "udp";
*res = se;
return 0;
}
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